FAS

U.S. Nuclear Stockpile Secrecy: A View from 1949

09.02.10 | 2 min read | Text by Steven Aftergood

The question of whether or not to disclose the number of nuclear weapons in the U.S. arsenal “goes to the very heart of our democratic system of government,” said Senator Brien McMahon (D-CT) in a newly rediscovered 1949 speech (pdf) on secrecy in nuclear weapons policy.

“Do we possess five bombs, or fifty bombs, or five hundred bombs?  Are we strong or weak in the field of atomic weapons?  Only the Atomic Energy Commissioners, high-ranking military men, and a few others know the correct answer to these vital questions,” Sen. McMahon said.

Sen. McMahon (1903-1952) was the principal author of the Atomic Energy Act of 1946, which established the Atomic Energy Commission and placed control of nuclear weapons in civilian hands.

“Though I have been a member of the Joint Congressional Committee on Atomic Energy since its inception, and though I have just been elected its chairman, I do not myself know how many bombs we possess or how rapidly we are making new ones,” he said.

“It is interesting to note that concealment of atomic production rates is secrecy of a scope which has never been attempted before during peacetime in the United States,” Sen. McMahon said. He indicated that he had not reached a definite conclusion as to whether the size of the stockpile size should be made public.

The text of Senator McMahon’s January 31, 1949 address to the Economic Club of Detroit was entered into his rather voluminous FBI file, which was obtained by researcher Michael Ravnitzky.

Illustrating the often glacial pace of secrecy reform, it was not until May 3 of this year that the current size of the nuclear arsenal was officially revealed for the first time.

publications
See all publications
Emerging Technology
Blog
Who Governs Government AI? The Challenge of Federal Implementation

Our analysis of federal AI governance across administrations shows that divergent compliance procedures and uneven institutional capacity challenge the government’s ability to deploy AI in ways that uphold public trust.

03.11.26 | 12 min read
read more
Environment
Blog
Igniting Innovation: Progress and a Path Forward for Wildfire Policy

From California to New Jersey, wildfires are taking a toll—costing the United States up to $424 billion annually and displacing tens of thousands of people. Congress needs solutions.

03.11.26 | 3 min read
read more
Emerging Technology
day one project
Policy Memo
Your DNA, Your Data: Preventing Genetic Discrimination in the Growing Bioeconomy

To secure the U.S. bio-infrastructure, maintain global leadership in biotechnology, and safeguard American citizens from emerging threats to their privacy, the federal government must modernize its approach to human genetic and biological data.

03.05.26 | 8 min read
read more
Government Capacity
Policy Memo
Report
Why Credit Access Makes or Breaks Clean Tech Adoption and What Policy Makers Can Do About It

To ensure an energy transition that brings broad based economic development, participation, and direct benefits to communities, we need federal policy that helps shape markets. Unfortunately, there is a large gap in understanding of how to leverage federal policy making to support access to capital and credit.

03.04.26 | 21 min read
read more